FIX RadEditor throws an error when its EditModes property is set to Preview in Chrome and Safari

The issue is related to the insert select functionality and is reproduced with .NET35. The workaround is to disable the selection by putting the following script below the RadEditor:
<script type="text/javascript">
Telerik.Web.UI.RadEditor.prototype._addHandlersForSelectTags = function ()
{ }
</script>